On big trucks the gears are NOT synchronized.So when you double clutch,you push down the clutch,move the stick to neutral,let cluch back out,let engine slow down RPMS,push down clutch,again,and put trans mission in next gear.You are making the gears match speed of the truck,so that it can be shifted.If you dont let the clutch back out after you put it in neutral,you cant shift it because when you push the clutch in,you disconnect the transmission from the engine and it slows down the gears faster than the engine slows down,then you cant shift until you reconnect the transmision to the engine by letting the clutch out again.
Its really nuts.For a long time now,people dont use the clutch.Years ago when they had straight cut gears,not heat treated,you would wear them out by grinding them.So you double clutched everything,cars and trucks.If you wear out hard,heat treated, gears we have now, grinding them,you better quit driving because you arent good at it!
Double clutching,even if it is recommended by transmission companys is just not done.Its not necessary.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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